Multiple hopper weighing and transfer system

Abstract

A multiple hopper system for improved forming of solid, flowing product into sequential batches or charges, transferring the batches between the hoppers, combination weighing/selection and discharging to a packaging machine is provided. A computer senses the batch weight and assigns the weight in sequence first to the transfer hopper, and then to the holding hopper. Both the transfer and holding hoppers participate in each computerized weighing/selection cycle. The forming hopper includes a shell and double-acting clam shell doors; the upper curved portion of each door extending into the hopper when the doors are open, thereby intercepting any late product in flight and initiating formation of the next batch. The transfer and holding hoppers also incorporate pairs of clam shell type doors. A curved transition chute is positioned below the holding hopper. The holding hopper doors slope at an angle in the direction along the closing lips of the door. The associated method, is characterized by forming and weighing the product in the first in-series hopper and then discharging the batch in sequence to the transfer and holding hoppers. These steps are repeated in succession, and checking of all hoppers by the computer is provided to generate an extended multiple shift mode of operation. In addition, there is a step of intercepting the product within the forming hopper to initiate forming of the next batch for further extension.